It will be cold soon and all those little ears are going to need covering. For girls ages from 0 to adult, you can use this crochet pattern for an Ice Queen hat that you can make for both a little girl and there is also a pattern to make a matching hat for a doll.
Mango Tree Creations shares the patterns. Almost any little girl would love this hat because it would remind her of the famous movie. With the snowflake and the long braid she could be a princess every day. I think it would be super cute if you made the color of the braid match the hair color of the little girl that would be wearing the hat too. It would be really special and made for no one other than that one special little one. If you have more than one little girl you can make each of them a hat with a different color and they will always know which one belong to whom.